The team says that the resort is used by "TDY personnel." TDY (Temporary DutY) is a term used by the Army, Air Force and civilian government agencies, but never in a Naval service. The Navy and Marines always say TAD (Temporary Assigned Duty).
Right after the scene in which the team first visits Abby's ex-boyfriend there's a tight closeup of the view outside the NCIS bullpen's window. The fact it's not an actual view but a photographic backdrop is particularly obvious in the shot.
In the beginning when Ducky is talking to Jimmy about jigsaw puzzles and the body parts, during one shot you can see the black outline of the crew in the reflection of the morgue drawers.